PTFE PRODuCTS

Optical PTFEThe reference for light

ManufactureBerghof optical PTFE consists of pure poly-tetrafluorethylene (PTFE). As a result of its incomparable whiteness and purity Berg-hof optical PTFE achieves virtually ideal Lambertian reflectance properties with a reflection coefficient of up to 98 % in the broad wavelength range of 250 to 2,500 nm. Here the special manufacturing pro-cess, the isostatic compression of the raw material, ensures an absolutely diffuse reflection over the whole surface of the component. In addition, the outstanding properties of the PTFE such as its high thermal stability of -200°C to +260°C and its UV resistance protect the components against discolouration and embrittlement. This guarantees permanent dimensional stability and functionality throughout its long lifespan.

Optical PTFEThe reference for light owing to the greatest diffuse reflection possible

Optical PTFE

At a glance Advantages

Extremely diffuse reflection up to >98 % (~250 - 2,500 nm)

Maximum and uniform light output with less expenditure of energy

Purest porous PTFE Significantly higher reflectance than components made of e.g. ceramic; free of perfluorooctane acid (PFOA)

High temperature resistance up to +260°C No embrittlement or deformation

High uV stability and universal chemical resistance

No reflection losses as a result of discolouration

Should the surface become contaminated it can be easily cleaned or mechanically treated

Simplified maintenance. No need for recoating with e.g. barium sulphate

Reduced speckle effect by lasers on the surface Increased contrast with laser projection

Dimensionally stable and flexible in design Individual customisation

Can be supplied in various shades of grey Defined degrees of reflectance for optical standards

Degree of reflectance from optical PTFE

Wavelength [nm]

100

Degr

ee o

f refl

ecta

nce

[%]

80

98%

70%

50%

20%

5% 2%

60

40

20

0250 750 1,250 1,750 2,250

Optical PTFE by Berghof is employed from optical measurement engineering, where particularly diffusely reflecting so-called Lambertian surfaces are required, right through to conventional lighting technology in which considerable light efficiency and natural colour rendition are critical. Regardless of the application, as a material with the greatest diffuse reflectance PTFE maximises the efficiency of light sources by spreading the light evenly.

The raw material for Berghof optical PTFE is the high-performance plastic PTFE (Teflon®). What is impressive about this material is its resistance to virtually all media as well as uV radiation and high temperatures. By using a special technology to process the plastic Berghof has succeeded in augmenting its outstanding characteristics with unique optical reflective properties. Berghof uses pure s-PTFE which, unlike e-PTFE, is obtai-

PTFE – the outstanding fluoroplastic

Can be used in a wide variety of applications

→ Diffusely reflecting material → Reflectance and fluorescent

standards in gradations → Lambertian reflectors and diffusers → Laser cavities → Ulbricht spheres → UV drying chambers → UV air and water sterilisers → Background lighting for displays → Reflectors and mixing chambers

for LED and OLED → Photobioreactors

ned from a suspension and which therefore does not require emulsifiers. This means that Berghof optical PTFE is entirely free of foreign matter such as pore-forming material or the emulsifier perfluorooctane acid (PFOA), which is suspected of being carcinogenic.

Physical-technical specifications

Optical PTFE, 98 % reflectance

Reference thickness 10.0 mm

Material Berghof optical PTFE – granulate made of porous, virgin polytetrafluorethylene (PTFE); symmetrically porous structureFree of PFOA; conforms to FDA standardsFree of heavy metals

Manufacturing process Material compression by isostatic compaction and sintering followed by mechanical processing

Colour White

Hardness 30 to 40 Shore D

Degree of reflectance 98 % in the visible wavelength range of 380 to 780 nm93 % in the wavelength range of 250 to 2,500 nm

Temperature resistance -200 to +260°C

Water solubility Insoluble in water The reflective properties alter with damp material

Chemical resistance Virtually universal

Physiological properties

SAFETY NOTE

Physiologically harmless

At temperatures of >400°C the harmful gaseous by-products from thermal decomposition need to be taken into account.

Transport and storage Non-hazardous materials in terms of the transport regulations, Water Hazard Classes WGK (0)The product is easily statically chargeable; avoid frictionCan be stored for an unlimited time at room temperature

Processing note No predefined direction of installation since it is symmetrically porous and carrier-freeSpecial processing notes apply to the self-adhesive version

Conformity Directive 10/2011/EC on plastic materials and articles intended to come into contact with food (implemented in Germany by the Consumer Goods Ordinance BedGgstV), complemented by directives 2011/8/EC, 2007/19/EC and 2002/72/ECDirective 2002/95/EC on the restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS)Directive 2003/11/EC regarding restrictions on the marketing and use of certain dangerous substances and preparations (pentabromodiphenyl ether, octabromodiphenyl ether)

Note: The producer is responsible for making sure that the end product complies with the standards named here.

Berghof Fluoroplastic Technology GmbH

Eningen Site | Harretstrasse 1 | 72800 Eningen | Germany | T +49.7121.894-0 | F +49.7121.894-300 | ptfe@berghof.com | www.berghof.com

42-4500-85-01-00-001, All rights are reserved; subject to changes and errors, Printed in Germany

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